The Giaour* was published in 1813, and is the first of Byron's Oriental Tales.  This story, although very fragmented, deals with the punishment of a female's infidelity.

It was a Turkish custom in that era, when a woman was unfaithful, to be sewed in a sack and cast into the sea.  When Byron was in Athens, he had rescued a woman destined for that fate.

*Definition:
  Giaour ( noun --- Islamic  --- a non-believer, an infidel --- "jour"  rhymes with power )